Toyota OE #90915-YZZD1
Still less optimal, but slightly bigger than the YZZA1 filter, but of the same (sub par) “grade” of construction as the YZZA1. OE for Lexus IS300 motor,
~$8 at any Toyota Parts Desk ($4 online)

Toyota Racing Development #00602-90915-006
USA made YZZA1 and 10004 replacement, not known to be used on an Elise yet. ~$13 online

Toyota Racing Development #00642-90915-003
Japanese made YZZA1 and 10004 replacement, not known to be used on an Elise yet. ~$22 online

Toyota Racing Development #90915-001
Japanese made (red housing) replacement, seems to be preferred by many eTalkers, but I cannot find much information on this filter. ~$24 online.

K&N HP-2009
Optimal filter, used by many eTalkers (endorsed by Stan!), good filtration (better than the OE stuff) and good flow. ~$12 at most auto parts stores.